SU747741A1 - Hydraulic press control system - Google Patents

Description

The invention relates to mechanical engineering, in particular to the design of hydraulic forging and pressing machines.

A hydraulic press control system is known, comprising a multi-stage hydraulic distributor with a drive, a power supply unit, sensors of the initial and final position — no press actuators electrically interconnected to each other and the drive tlj.

This control system is characterized by drawbacks due to the limited possibilities for changing technological transitions and, consequently, the range of sizes of pressable items. In addition, the system is known to be difficult to set up a cycle. 20 The purpose of the invention is to expand the range of sizes of processed products.

To achieve this goal, the hydraulic press control system is equipped with a driver connected to the drive, light sources connected to the power supply unit, photo sensors and control cells of the distributor connected in parallel.

Target power supply, and each cell is made in the form of series-connected disconnecting. contacts of the end position sensor, thyristor and executive device. In this case, the multi-position distribution box is designed with an electrically controlled spool valve, and the burning device is in the form of an endless tape tape, kinematically connected with the said drive. This system is also equipped with adjustment buttons 1Mi control, parallel to the photosensors,

FIG. 1 is a diagram of the control system; in fig. 2 is an electrical circuit of control cells.

The control system contains a drive 1, a power supply unit 2, a light source 3 connected to the power supply unit 2, a photosensor unit 4, a multi-position distributor 5, a control unit 6 of the distributor 5 in an amount equal to the number of operations (turns) of the technological cycle and connected to power supply unit 2. Sensors 7, 8, 9, 10 and 11, which control the initial position, and sensors 12-21, which control the final position

The executive mechanisms 22 are interconnected between each other, power supply unit 2 cheekgi and 6 controls. Each control cell 6 is made in the form of sequentially connected sensors 12-21 with break contacts, thyristors 23 and 24, actuators .25 and 26 included in the multi-position spool valve 5. The driver 27 connected to the drive 1 and made in i the form of an infinite punched tape with a printed program in the form of slits, which are equivalent to the number of operations in a tegnologic cycle, and operating in a closed loop with a transition from the final operation to the initial one.

For preprocessing technological processes in the setup mode, the system has control buttons 28 and 29 connected in parallel to the photosensors 30 and 31.

The hydraulic spring control system operates as follows.

When the control system is turned on, a closed electrical circuit consisting of sensors 7, 8, 9 and 10 of the reference position, or sensor 12-21 of the end position from the power supply unit 2 receives a signal to the actuator 1 and the driver 27 is transferred to the subsequent position. The beginning of the operation of the technological cycle occurs when there is an electrical circuit composed of serially connected command sensor 12, with the opening contact and controlling the final position of the operation performed by the cell 6 of the thyristor 23 and the actuating device 25, which is created by the appearance of a signal from the source 3 of the light on the photosensor 30 through a perforation in a punched tape. In the photosensor 30, a current sufficient to open the thyristor 23 arises. The press mechanism moves until the operation of the command sensor 13 trips. This closes the contacts 13, the driver 27 is transferred to the subsequent position and by means of the source 3 of light on the photosensor 31 creates a circuit for the photo sensor 31 the work of the subsequent control cell b, therefore, of the subsequent operation (transition).

In case the technological process provides for a mechanism or a block of press mechanisms, when moving to the final position in some sequence, remained under pressure until some operation, it is necessary to connect this cell or block of cells through an appropriate sensor with opening contacts, controlling the final position of a series of operations to power supply unit 2.

The efficiency of using the hydraulic press control system is due to the expansion of the range of compressible products and the improvement of the conditions for adjusting the pressing cycle.

Claims (2)

1. A hydraulic press control system comprising a multi-positioned valve with a drive, a power supply unit, sensors for the initial and final position of the press actuators electrically connected to each other and a drive, characterized in that, in order to expand the range of sizes of workpieces, it is connected to driven by a driver, a light source connected to the power supply unit by photosensors and distributor control cells connected in parallel to the power supply unit, moreover each cell is made in the form of series-connected disconnecting contacts of the end position sensor, a thyristor and an executive device, while the multi-position distributor is made zo-rifle with electric control, and the master device is in the form of an endless puncture tape kinematically connected with the said drive . 2. The system according to claim 1, so that it is equipped with adjustment control buttons, which are connected parallel to the photosensors. Sources of information taken by the HE in the examination 1. USSR author's certificate No. 300347, cl. B 30 V 15/26, 1971.